package socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

public class Server {
    private  ServerSocket serverSocket;

    public Server(){
        try{
            /*
              如果端口被其他程序占用了，则会发生异常
              解决办法：
              1.更换端口号
              2.杀死占用该端口的进程


             */
            System.out.println("正在启动服务端");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务器启动完毕！");

        } catch (IOException exception) {
            exception.printStackTrace();
        }

    }

    public void start(){
        /*
          ServerSocket提供的重要方法：
          Socket accept()


         */
        try{
            while(true) {
                System.out.println("等待客户端连接");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接上了");

            InputStream in = socket.getInputStream(); //低级流
            InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
            BufferedReader br = new BufferedReader(isr);
            //读取一行来自远端计算机（客户端）发送过来的字符串//String message = br.readLine();//System.out.println("客户端说："+message);
            String message;

            //当我们通过br.readLine()读取来自远端计算机（客户端）发送过来的字符串时,
            //远端计算机只有调用socket.close()正常断开，readline（）才会返回null

            while((message = br.readLine())!=null) {
                System.out.println("客户端说：" + message);
            }
            }
            /*
            InputStream in = socket.getInputStream(); //低级流
            InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
            BufferedReader br = new BufferedReader(isr);
            //读取一行来自远端计算机（客户端）发送过来的字符串//String message = br.readLine();//System.out.println("客户端说："+message);
            String message;

                //当我们通过br.readLine()读取来自远端计算机（客户端）发送过来的字符串时,
                //远端计算机只有调用socket.close()正常断开，readline（）才会返回null

            while((message = br.readLine())!=null){
                System.out.println("客户端说："+message);
            }
            */

        }catch (IOException exception) {
            exception.printStackTrace();
        }

    }

    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }
}
